Apparatus for testing or measuring sizes or dimensions



Nov. 14, 1944;

G. F. PEMBROKE 2,362,924 APPARATUS FOR TESTING OR MEASURING SIZES OR DIMENSIONS A 2 SheetsI-Sheet' 1 Filed March 26, 1942 Nov. 14, 1944. cs. F. PEMBROKE APPARATUS FOR TESTING OR MEASURING SIZES OR DIMENSIONS Filed March 26, 1942 2 Sheets-Sheet 2 7/// //////Q -1*. 9 I Tn? unf 2d 5 21M u u /H 1 mm h mvm UM vj 3 i. u U NFL n9 fl M 3 l- Flt [1: van for Patented Nov. 14, 1944 were a;

i i3 invention .concernsimprovements in or relating to apparatus for testing '.or measuring sizes .or dimensions, hereinafter referred toQa's .imeaSllfi-ng .apparatusi Accorfding to the. invention .there .is provided lmexuf'uigi anparatuscompmsinein wcombin'alien, ,a reciprocable feeler, a measurement transmitfter reciprocable inafixed path .-.transv erselto.that .pf said .feeler, an abutment carried .by the feeler,

5 ports."

(01. rte-411a) en ag d by vertical uides 3', iithes euifies be n 'arra'ngedf'to ensure thatth'e caseis nithetco rect position Wh nb re t n niheiv .s apedsup- When the age taster positioned on th shaped supports the lower, portion the groove .and a further abutment carried ibyl the ftrans- V ,mi'tter; cachet lthea'hutments haying aislop'iug portion, the abutments .bejingcaused to en age at their sloping surfaces whichareiso arranged .that, .the vposition assumed ":by the ifelenaibut- ,mentdeftermines "the extent to which "the transmitter-a'butment may move in its (fixed path.

The engaging sloping portions may be. 'par-- allel .so .as .to -constitute supposed wedges which are 'arranged'to engage each other on movement of the transmitter towards the feeler when a measuring operation is effected, whereby the extent of engagement of the sloping portions along one another determines the extent of movement of the transmitter towards the feeler. Each of the abutments may be conically shaped, the angles between the engaging sloping portions of the abutments and the direction of movement of their respective members being complementary so as to constitute opposed parallel wedges. One embodiment of the invention will now be described by way of example with reference to the accompanying drawings which show part of a machine for measuring an external diameter of a cartridge-case, which latter'will be referred to hereinafter as a case.

In the drawings: s

Figure l is a front elevation of the measuring apparatus. r

Figure 2 is a side elevation of Figure 1.

' Figure 3 is a front elevation of a fragment of a feeler.

Figure l is a section of Figure 3.

For the purpose of the present description the cases shown are of the kind in which each case has a groove near the base thereof. It is the measurement of this groove which will be described below.

Cases 30 are fed in succession on to V shaped supports 2 which are located at the position at which the measurement of the groove of a case is to be effected. The mechanism for feeding the cases to the V shaped supports is preferably similar to that described in the co-pending British patent application No. 3437/41.

As the cases are moved towards and on to the is verti ally ireci receble .a u de 1 .0ve,11 en't'0 7th. .feelie i s" e ected by means gof 1ariev rpjpivogtee a..zs.tun's;fixe 13,9 andfconnectedfto the element r se the lever .and

so "by .a sp in E3. The

eral portion of the groove; see Figures 3 and 4 which show the operative part of the feeler to a larger scale. is chamfered in the same manner as the feeler 5. Also at the position which is near the lower end of the feeler there is secured an abutment M which is ofconical shape. The purpose of this abutment will be described below.

Measurements effected by the feeler are transmitted therefrom to indicator-mechanism which is similar to that referred to in the specification accompanying United States patent application Serial No. 399,561. This indicator-mechamsm includes a slidable bar 53 which supports a magnet, and also indicator-members. The sliding bar in the present instance comprises a transmitter through which measurements effected by the feeler are transmitted to the indicator mechanism. The end of the sliding bar which is nearest the feeler is provided with a further abutment l6, which is also of conical shape. The feeler and the sliding bar 53 are movable in paths which are normal to each other and, in the construction being described, the apex angle of each of the contacts is 90, so

yjshapejd'supports, ,it'he leases of "the bases a e.

The anvil 4 is of V shape but that the angles between the sloping portions and engages with the abutment [4 on the feeler. The apparatus is so set initially that if the diameter at the bottom of the groove of the case is found to be within the desired limits, the abutments will engage each other to a predetermined extent. Should, however, the diameter at the bottom of the groove be greater or less than. the desired diameter, the extent of engagement between the conical surfaces will be less or greater than that to which the abutments were originally set. Thus, the extent to which the abutments engage each other determines the extent of movement of the-sliding bar and this in turn determines the operation of the indicatormechanism.

If desired, the abutments could comprise wedge secure by Letters Patent is:

'1. Measuring apparatus, comprising in combination, a reciprocable feeler member, a measurement transmitter member reciprocable in a fixed path transverse to that of said feeler member, each of said members being formed with a sloping surface, the said sloping surfaces cooperatively engaging to limit reciprocation of the members toward each other, each of said sloping surfaces forming with the direction of reciprocation of one of said members an angle which is complementary to the corresponding angle formed by the other of said sloping surfaces, at least one of said surfaces being convexly curved in planes normal to such direction of reciprocation, means to position the feeler member in contact with a work piece, and means operable subsequently tothe said positioning of the feeler member for yieldably urging saidi transmitter member toward said feeler member, whereby said surfaces are caused to engage with a line contact and thereby the position assumed by the feeler member determines the extent of movement of the transmitter member in its fixed path through the co-action of said surfaces.

2. Measuring apparatus, comprising in combination, a reciprocable feeler member, a measurement transmitter member reciprocable in a fixed path transverse to that of said feeler member, each of said members being formed with a conical surface of which the axis extends in the direction of reciprocation of one of said members, the said conical surfaces cooperatively engaging to limit reciprocation of the members toward each other, the'apex angles of said conisubsequently to the position'of' the feeler member, yieldingly to urge the transmitter member towards the "feeler member when so positioned whereby the extent of movementof one member may be limited by the other member through the co-action of said surfaces.

3. Measuring apparatus as claimed in claim 2 in which the apex angle of each of said conical surfaces is GEORGE FREDERICK PEMBROKE. 

